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Fix usage of wrlock by DNS_Cache::empty() #4560

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andrey-utkin
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Emptying is a modifying operation, so it must claim write-mode lock, not read-mode lock.

Emptying is a modifying operation, so it must claim write-mode lock, not
read-mode lock.
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Sorry, got confused. empty() is a read-only bool method, clear() is "emptying" the cache.

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